53 lines
1.4 KiB
Go
53 lines
1.4 KiB
Go
/*
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Copyright 2022 The Flux authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package digest
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import (
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"crypto"
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_ "crypto/sha1"
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_ "crypto/sha256"
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_ "crypto/sha512"
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"fmt"
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"github.com/opencontainers/go-digest"
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_ "github.com/opencontainers/go-digest/blake3"
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)
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const (
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SHA1 digest.Algorithm = "sha1"
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)
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var (
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// Canonical is the primary digest algorithm used to calculate checksums.
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Canonical = digest.SHA256
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)
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func init() {
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// Register SHA-1 algorithm for support of e.g. Git commit SHAs.
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digest.RegisterAlgorithm(SHA1, crypto.SHA1)
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}
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// AlgorithmForName returns the digest algorithm for the given name, or an
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// error of type digest.ErrDigestUnsupported if the algorithm is unavailable.
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func AlgorithmForName(name string) (digest.Algorithm, error) {
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a := digest.Algorithm(name)
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if !a.Available() {
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return "", fmt.Errorf("%w: %s", digest.ErrDigestUnsupported, name)
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}
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return a, nil
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}
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